Onyx brings more than 40 years of British design and engineering to every stove it makes, and its solid fuel range builds on decades of expertise in burning wood cleanly and efficiently. As part of the Stovax Heating Group, Onyx designs and tests each model in its own research and development laboratories.

The collection comes in two styles. The Athos has graceful proportions and heritage-inspired detailing for a classic look, while the Olympus has clean, contemporary lines for modern interiors. Each comes in two sizes: the 5 is a dedicated woodburner, and the larger 5 Wide has a fixed multi-fuel grate for wood or approved smokeless fuels. All four have a steel body and a cast iron door that opens to 180°.

Every Onyx stove is Ecodesign compliant and approved for Smoke Control Areas as standard, with Cleanburn and Airwash systems for efficient burning and clear glass. A convector heat system spreads warmth around the room, and an optional outdoor air kit lets the stove draw combustion air from outside.